dark machamp pokemon card Holofoil - Team Rocket Weakness Psychic ×2 Retreat Cost Team Rocket - Dark Machamp

So a given sponsor pack might not have any cards that are Interesting in the event that the Uncommon space is involved by something like a Holo Intriguing or Ultra Uncommon

People notice the difference and start calling the old unlimited cards Shadowless

There are actually a lot of ways the exile zone gets used in regular gameplay across all formats

Whether its a sideboarded Mirran Crusader, a pile of Lingering Souls tokens, an Etched Champion, a Young Pyromancer and company, a Nexus of the Blinkmoth or Inkmoth variety, fourteen 1/1 Goblin tokens, or simply a small pile of mana accelerants, Kozileks Return will clean them all up at instant speed, and theres no saving them with Burrenton Forge-Tender